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<a name="GstPluginFeature"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="GstPluginFeature.top_of_page"></a>GstPluginfeature</span></h2>
<p>GstPluginfeature — Base class for contents of a GstPlugin</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
</tr></table></div>
<div class="refsect1">
<a name="GstPluginFeature.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<span class="c_punctuation">(</span><a class="link" href="GstPluginFeature.html#GstPluginFeatureFilter" title="GstPluginFeatureFilter ()">*GstPluginFeatureFilter</a><span class="c_punctuation">)</span> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstPluginFeature.html#gst-plugin-feature-set-rank" title="gst_plugin_feature_set_rank ()">gst_plugin_feature_set_rank</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstPluginFeature.html#gst-plugin-feature-set-name" title="gst_plugin_feature_set_name()">gst_plugin_feature_set_name</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
</td>
<td class="function_name">
<a class="link" href="GstPluginFeature.html#gst-plugin-feature-get-rank" title="gst_plugin_feature_get_rank ()">gst_plugin_feature_get_rank</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstPluginFeature.html#gst-plugin-feature-get-name" title="gst_plugin_feature_get_name()">gst_plugin_feature_get_name</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstPlugin.html" title="GstPlugin"><span class="returnvalue">GstPlugin</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstPluginFeature.html#gst-plugin-feature-get-plugin" title="gst_plugin_feature_get_plugin ()">gst_plugin_feature_get_plugin</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstPluginFeature.html#gst-plugin-feature-get-plugin-name" title="gst_plugin_feature_get_plugin_name ()">gst_plugin_feature_get_plugin_name</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="returnvalue">GstPluginFeature</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstPluginFeature.html#gst-plugin-feature-load" title="gst_plugin_feature_load ()">gst_plugin_feature_load</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
</td>
<td class="function_name">
<a class="link" href="GstPluginFeature.html#gst-plugin-feature-list-copy" title="gst_plugin_feature_list_copy ()">gst_plugin_feature_list_copy</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="GstPluginFeature.html#gst-plugin-feature-list-free" title="gst_plugin_feature_list_free ()">gst_plugin_feature_list_free</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="define_keyword">#define</td>
<td class="function_name">
<a class="link" href="GstPluginFeature.html#GST-PLUGIN-FEATURE-LIST-DEBUG:CAPS" title="GST_PLUGIN_FEATURE_LIST_DEBUG()">GST_PLUGIN_FEATURE_LIST_DEBUG</a><span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="GstPluginFeature.html#gst-plugin-feature-check-version" title="gst_plugin_feature_check_version ()">gst_plugin_feature_check_version</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
</td>
<td class="function_name">
<a class="link" href="GstPluginFeature.html#gst-plugin-feature-rank-compare-func" title="gst_plugin_feature_rank_compare_func ()">gst_plugin_feature_rank_compare_func</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstPluginFeature.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword"> </td>
<td class="function_name"><a class="link" href="GstPluginFeature.html#GstPluginFeature-struct" title="GstPluginFeature">GstPluginFeature</a></td>
</tr>
<tr>
<td class="datatype_keyword">enum</td>
<td class="function_name"><a class="link" href="GstPluginFeature.html#GstRank" title="enum GstRank">GstRank</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="GstPluginFeature.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="screen">    <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GObject-struct">GObject</a>
    <span class="lineart">╰──</span> <a href="/usr/share/gtk-doc/html/gobject/gobject-The-Base-Object-Type.html#GInitiallyUnowned">GInitiallyUnowned</a>
        <span class="lineart">╰──</span> <a class="link" href="GstObject.html" title="GstObject">GstObject</a>
            <span class="lineart">╰──</span> GstPluginFeature
                <span class="lineart">├──</span> <a class="link" href="GstElementFactory.html" title="GstElementFactory">GstElementFactory</a>
                <span class="lineart">├──</span> <a class="link" href="GstTracerFactory.html" title="GstTracerFactory">GstTracerFactory</a>
                <span class="lineart">├──</span> <a class="link" href="GstTypeFindFactory.html" title="GstTypeFindFactory">GstTypeFindFactory</a>
                <span class="lineart">├──</span> <a class="link" href="GstDeviceProviderFactory.html" title="GstDeviceProviderFactory">GstDeviceProviderFactory</a>
                <span class="lineart">╰──</span> <a class="link" href="GstDynamicTypeFactory.html" title="GstDynamicTypeFactory">GstDynamicTypeFactory</a>
</pre>
</div>
<div class="refsect1">
<a name="GstPluginFeature.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/gst.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="GstPluginFeature.description"></a><h2>Description</h2>
<p>This is a base class for anything that can be added to a <a class="link" href="GstPlugin.html" title="GstPlugin"><span class="type">GstPlugin</span></a>.</p>
</div>
<div class="refsect1">
<a name="GstPluginFeature.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="GstPluginFeatureFilter"></a><h3>GstPluginFeatureFilter ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
<span class="c_punctuation">(</span>*GstPluginFeatureFilter<span class="c_punctuation">)</span> (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>,
                           <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gpointer"><span class="type">gpointer</span></a> user_data</code></em>);</pre>
<p>A function that can be used with e.g. <a class="link" href="GstRegistry.html#gst-registry-feature-filter" title="gst_registry_feature_filter ()"><code class="function">gst_registry_feature_filter()</code></a>
to get a list of pluginfeature that match certain criteria.</p>
<div class="refsect3">
<a name="GstPluginFeatureFilter.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>feature</p></td>
<td class="parameter_description"><p>the pluginfeature to check</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>user_data</p></td>
<td class="parameter_description"><p>the user_data that has been passed on e.g.
<a class="link" href="GstRegistry.html#gst-registry-feature-filter" title="gst_registry_feature_filter ()"><code class="function">gst_registry_feature_filter()</code></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="GstPluginFeatureFilter.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> for a positive match, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-plugin-feature-set-rank"></a><h3>gst_plugin_feature_set_rank ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_plugin_feature_set_rank (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>,
                             <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> rank</code></em>);</pre>
<p>Specifies a rank for a plugin feature, so that autoplugging uses
the most appropriate feature.</p>
<div class="refsect3">
<a name="gst-plugin-feature-set-rank.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>feature</p></td>
<td class="parameter_description"><p>feature to rank</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>rank</p></td>
<td class="parameter_description"><p>rank value - higher number means more priority rank</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-plugin-feature-set-name"></a><h3>gst_plugin_feature_set_name()</h3>
<pre class="programlisting">#define                 gst_plugin_feature_set_name(feature,name) gst_object_set_name(GST_OBJECT_CAST(feature),name)
</pre>
<p>Sets the name of the plugin feature, getting rid of the old name if there was one.</p>
<div class="refsect3">
<a name="gst-plugin-feature-set-name.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>feature</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a> to set the name of.</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>name</p></td>
<td class="parameter_description"><p>the new name</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-plugin-feature-get-rank"></a><h3>gst_plugin_feature_get_rank ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
gst_plugin_feature_get_rank (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>);</pre>
<p>Gets the rank of a plugin feature.</p>
<div class="refsect3">
<a name="gst-plugin-feature-get-rank.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>feature</p></td>
<td class="parameter_description"><p>a feature</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-plugin-feature-get-rank.returns"></a><h4>Returns</h4>
<p> The rank of the feature</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-plugin-feature-get-name"></a><h3>gst_plugin_feature_get_name()</h3>
<pre class="programlisting">#define                 gst_plugin_feature_get_name(feature)      GST_OBJECT_NAME(feature)
</pre>
<p>Returns the name of <em class="parameter"><code>feature</code></em>
.
For a nameless plugin feature, this returns <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.</p>
<div class="refsect3">
<a name="gst-plugin-feature-get-name.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>feature</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a> to get the name of <em class="parameter"><code>feature</code></em>
.</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-plugin-feature-get-name.returns"></a><h4>Returns</h4>
<p>the name of <em class="parameter"><code>feature</code></em>
. MT safe. </p>
<p><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-plugin-feature-get-plugin"></a><h3>gst_plugin_feature_get_plugin ()</h3>
<pre class="programlisting"><a class="link" href="GstPlugin.html" title="GstPlugin"><span class="returnvalue">GstPlugin</span></a> *
gst_plugin_feature_get_plugin (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>);</pre>
<p>Get the plugin that provides this feature.</p>
<div class="refsect3">
<a name="gst-plugin-feature-get-plugin.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>feature</p></td>
<td class="parameter_description"><p>a feature</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-plugin-feature-get-plugin.returns"></a><h4>Returns</h4>
<p>the plugin that provides this
feature, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a>.  Unref with <a class="link" href="GstObject.html#gst-object-unref" title="gst_object_unref ()"><code class="function">gst_object_unref()</code></a> when no
longer needed. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-plugin-feature-get-plugin-name"></a><h3>gst_plugin_feature_get_plugin_name ()</h3>
<pre class="programlisting">const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> *
gst_plugin_feature_get_plugin_name (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>);</pre>
<p>Get the name of the plugin that provides this feature.</p>
<div class="refsect3">
<a name="gst-plugin-feature-get-plugin-name.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>feature</p></td>
<td class="parameter_description"><p>a feature</p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-plugin-feature-get-plugin-name.returns"></a><h4>Returns</h4>
<p>the name of the plugin that provides this
feature, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> if the feature is not associated with a
plugin. </p>
<p><span class="annotation">[<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix10.html#api-index-1.2">1.2</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-plugin-feature-load"></a><h3>gst_plugin_feature_load ()</h3>
<pre class="programlisting"><a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="returnvalue">GstPluginFeature</span></a> *
gst_plugin_feature_load (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>);</pre>
<p>Loads the plugin containing <em class="parameter"><code>feature</code></em>
 if it's not already loaded. <em class="parameter"><code>feature</code></em>
 is
unaffected; use the return value instead.</p>
<p>Normally this function is used like this:</p>
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
        <td class="listing_lines" align="right"><pre>1
2
3
4
5
6</pre></td>
        <td class="listing_code"><pre class="programlisting">GstPluginFeature <span class="gtkdoc opt">*</span>loaded_feature<span class="gtkdoc opt">;</span>

loaded_feature <span class="gtkdoc opt">=</span> <span class="function"><a href="GstPluginFeature.html#gst-plugin-feature-load">gst_plugin_feature_load</a></span> <span class="gtkdoc opt">(</span>feature<span class="gtkdoc opt">);</span>
<span class="gtkdoc slc">// presumably, we&apos;re no longer interested in the potentially-unloaded feature</span>
<span class="function"><a href="GstObject.html#gst-object-unref">gst_object_unref</a></span> <span class="gtkdoc opt">(</span>feature<span class="gtkdoc opt">);</span>
feature <span class="gtkdoc opt">=</span> loaded_feature<span class="gtkdoc opt">;</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p></p>
<div class="refsect3">
<a name="gst-plugin-feature-load.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>feature</p></td>
<td class="parameter_description"><p>the plugin feature to check. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>]</span></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-plugin-feature-load.returns"></a><h4>Returns</h4>
<p>a reference to the loaded
feature, or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> on error. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-plugin-feature-list-copy"></a><h3>gst_plugin_feature_list_copy ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
gst_plugin_feature_list_copy (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *list</code></em>);</pre>
<p>Copies the list of features. Caller should call <em class="parameter"><code>gst_plugin_feature_list_free</code></em>

when done with the list.</p>
<div class="refsect3">
<a name="gst-plugin-feature-list-copy.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>list
of <a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.PluginFeature]</span></td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-plugin-feature-list-copy.returns"></a><h4>Returns</h4>
<p>a copy of <em class="parameter"><code>list</code></em>
,
with each feature's reference count incremented. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.PluginFeature]</span></p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-plugin-feature-list-free"></a><h3>gst_plugin_feature_list_free ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_plugin_feature_list_free (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> *list</code></em>);</pre>
<p>Unrefs each member of <em class="parameter"><code>list</code></em>
, then frees the list.</p>
<div class="refsect3">
<a name="gst-plugin-feature-list-free.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>list
of <a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a>. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.PluginFeature]</span></td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="GST-PLUGIN-FEATURE-LIST-DEBUG:CAPS"></a><h3>GST_PLUGIN_FEATURE_LIST_DEBUG()</h3>
<pre class="programlisting">#define GST_PLUGIN_FEATURE_LIST_DEBUG(list) gst_plugin_feature_list_debug(list)
</pre>
<p>Debug the plugin feature names in <em class="parameter"><code>list</code></em>
.</p>
<div class="refsect3">
<a name="GST-PLUGIN-FEATURE-LIST-DEBUG.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>list</p></td>
<td class="parameter_description"><p>a <a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> of
plugin features. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="Don't free data after the code is done."><span class="acronym">transfer none</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> Gst.PluginFeature]</span></td>
</tr></tbody>
</table></div>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-plugin-feature-check-version"></a><h3>gst_plugin_feature_check_version ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_plugin_feature_check_version (<em class="parameter"><code><a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a> *feature</code></em>,
                                  <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> min_major</code></em>,
                                  <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> min_minor</code></em>,
                                  <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> min_micro</code></em>);</pre>
<p>Checks whether the given plugin feature is at least
 the required version</p>
<div class="refsect3">
<a name="gst-plugin-feature-check-version.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>feature</p></td>
<td class="parameter_description"><p>a feature</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>min_major</p></td>
<td class="parameter_description"><p>minimum required major version</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>min_minor</p></td>
<td class="parameter_description"><p>minimum required minor version</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>min_micro</p></td>
<td class="parameter_description"><p>minimum required micro version</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-plugin-feature-check-version.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the plugin feature has at least
the required version, otherwise <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a>.</p>
</div>
</div>
<hr>
<div class="refsect2">
<a name="gst-plugin-feature-rank-compare-func"></a><h3>gst_plugin_feature_rank_compare_func ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gint"><span class="returnvalue">gint</span></a>
gst_plugin_feature_rank_compare_func (<em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gconstpointer"><span class="type">gconstpointer</span></a> p1</code></em>,
                                      <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gconstpointer"><span class="type">gconstpointer</span></a> p2</code></em>);</pre>
<p>Compares the two given <a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a> instances. This function can be
used as a <a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GCompareFunc"><span class="type">GCompareFunc</span></a> when sorting by rank and then by name.</p>
<div class="refsect3">
<a name="gst-plugin-feature-rank-compare-func.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>p1</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>p2</p></td>
<td class="parameter_description"><p>a <a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-plugin-feature-rank-compare-func.returns"></a><h4>Returns</h4>
<p> negative value if the rank of p1 &gt; the rank of p2 or the ranks are
equal but the name of p1 comes before the name of p2; zero if the rank
and names are equal; positive value if the rank of p1 &lt; the rank of p2 or the
ranks are equal but the name of p2 comes before the name of p1</p>
</div>
</div>
</div>
<div class="refsect1">
<a name="GstPluginFeature.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstPluginFeature-struct"></a><h3>GstPluginFeature</h3>
<pre class="programlisting">typedef struct _GstPluginFeature GstPluginFeature;</pre>
<p>Opaque <a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a> structure.</p>
</div>
<hr>
<div class="refsect2">
<a name="GstRank"></a><h3>enum GstRank</h3>
<p>Element priority ranks. Defines the order in which the autoplugger (or
similar rank-picking mechanisms, such as e.g. <a class="link" href="gstreamer-GstUriHandler.html#gst-element-make-from-uri" title="gst_element_make_from_uri ()"><code class="function">gst_element_make_from_uri()</code></a>)
will choose this element over an alternative one with the same function.</p>
<p>These constants serve as a rough guidance for defining the rank of a
<a class="link" href="GstPluginFeature.html" title="GstPluginfeature"><span class="type">GstPluginFeature</span></a>. Any value is valid, including values bigger than
<em class="parameter"><code>GST_RANK_PRIMARY</code></em>
.</p>
<div class="refsect3">
<a name="GstRank.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="enum_members_name">
<col class="enum_members_description">
<col width="200px" class="enum_members_annotations">
</colgroup>
<tbody>
<tr>
<td class="enum_member_name"><p><a name="GST-RANK-NONE:CAPS"></a>GST_RANK_NONE</p></td>
<td class="enum_member_description">
<p>will be chosen last or not at all</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-RANK-MARGINAL:CAPS"></a>GST_RANK_MARGINAL</p></td>
<td class="enum_member_description">
<p>unlikely to be chosen</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-RANK-SECONDARY:CAPS"></a>GST_RANK_SECONDARY</p></td>
<td class="enum_member_description">
<p>likely to be chosen</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
<tr>
<td class="enum_member_name"><p><a name="GST-RANK-PRIMARY:CAPS"></a>GST_RANK_PRIMARY</p></td>
<td class="enum_member_description">
<p>will be chosen first</p>
</td>
<td class="enum_member_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
</div>
</div>
<div class="refsect1">
<a name="GstPluginFeature.see-also"></a><h2>See Also</h2>
<p><a class="link" href="GstPlugin.html" title="GstPlugin"><span class="type">GstPlugin</span></a></p>
</div>
</div>
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